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Here is an astrological aspectarian software program which may prove useful to astrologers and programmers both. This program uses the Astrodienst Swiss Ephemeris (click here) to do all planetary calculations. Please see Astrodienst's web page for the details of the Swiss Ephemeris license (click here) and other documentation.
SE_Aspectarian generates geo and helio longitudinal and declination/latitude aspectarian data between any two given dates for all the planets and main asteroids, including exact aspects between these bodies and a specified natal chart or fixed zodiacal degree - and more.
Download SE_Aspectarian_v126_install.exe (v1.26), 3,380,549, 04 October 2011. Once downloaded, simply double-click on the file to install the program. The needed ephemeris files for the program are contained in the installation package.